Kev npaj cov txheej txheem ntawm polyamide adhesives

Kev npaj ntawm Dimeric Linoleic Acid: Linoleic acid, av nplaum, lithium carbonate, thiab dej tau ntxiv rau lub reactor thiab nplawm ntawm lub siab ntawm 0.8-1.2 MPa. Qhov kub tau nce mus rau 230℃thiab ua rau 5 teev. Tom qab ntawd qhov sib tov tau txias rau 100 degree, thiab 1.92 g ntawm phosphoric acid aqueous tov tau ntxiv. Tom qab ntawd lub siab tau txo mus rau 0.3-0.5 MPa, thiab qhov kub tau nce mus rau 150℃rau 1 teev. Thaum kawg, qhov kub thiab txias tau qis rau 100 degree, thiab qhov sib tov tau lim thaum kub kom tshem tawm cov catalyst. Unpolymerized unsaturated fatty acids ces evaporated nyob rau hauv lub tshuab nqus tsev siab (6.7–10.7 Pa) ntawm 220–225℃kom tau siab-purity dimerized linoleic acid.

Kev npaj ntawm Polyamide Kub Melt Adhesive: Nyob rau hauv kev tiv thaiv nitrogen, sib tov ntawm ethylenediamine thiab hexamethylenediamine tau maj mam ntxiv dropwise thaum nplawm thiab cua sov qhov sib tov rau 130 degree. Nyob rau lub sijhawm no, qhov ntsuas kub yog tswj ntawm 140-150 degree. Tom qab qhov sib ntxiv ua tiav, qhov ntsuas kub tau nce mus rau 205-220℃thiab cov tshuaj tiv thaiv txuas ntxiv mus txog thaum cov dej ntsiab lus ntawm cov khoom mus txog qhov ntsuas theoretical. Tom qab ntawd, lub siab txo qis, thiab cov tshuaj tiv thaiv txuas ntxiv rau lwm teev ntawm 1.3-2.7 kPa thiab 220-230 degree. Thaum kawg, tus qauv raug coj los txiav txim tus nqi amine. Yog tias nws ua tau raws li qhov ntsuas (ib puag ncig 10), cov khoom tuaj yeem txias thiab tawm. Lub softening point ntawm kub yaj nplaum nws txawv nyob ntawm seb tus nqi ntawm dilinoleic acid, sebacic acid, ethylenediamine, thiab hexamethylenediamine siv.